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Re: [TLS] Consensus call on codepoint strategy for draft-ietf-tls-hybrid-design

Bas Westerbaan <bas@cloudflare.com> Sat, 01 April 2023 00:04 UTC

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From: Bas Westerbaan <bas@cloudflare.com>
Date: Sat, 01 Apr 2023 02:04:06 +0200
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To: Ilari Liusvaara <ilariliusvaara@welho.com>
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Subject: Re: [TLS] Consensus call on codepoint strategy for draft-ietf-tls-hybrid-design
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Regarding additional key agreements.

For the (public) web it would be best if we can agree on a default key
agreement. If one half uses P-256+Kyber768 and the other X25519+Kyber768,
then clients will either HRR half the time or need to send both. Neither
are ideal.

Obviously this point is moot for internal networks. So I do not
oppose specifying additional preliminary key agreements, but I do not like
to actively support it. What about specifying further preliminary key
agreements in yet again a separate draft?

Best,

 Bas

On Sat, Apr 1, 2023 at 1:56 AM Bas Westerbaan <bas@cloudflare.com> wrote:

> The draft draft-tls-westerbaan-xyber768d00-00 references
>> draft-cfrg-schwabe-kyber-01, which has a number of annoying mistakes,
>> since fixed in editor's copy.
>>
>> And then, the correct reference for X25519 is probably RFC7748 instead
>> of RFC8037...
>>
>>
>> Really quick and dirty way to fix this would be to publish editor's
>> copy as draft-cfrg-schwabe-kyber-02 (or if CFRG adapts quickly, the
>> RG-00), and then publish draft-tls-westerbaan-xyber768d00-01, fixing
>> the references.
>>
>
> Thanks, done. Posted -02 of both the Kyber and Xyber drafts.
>
> Best,
>
>  Bas
>
>

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